<style>div { position:absolute; width:200px; height:200px; }</style>
<div style="background: -moz-radial-gradient(50px 80px, circle closest-side, white, black); top:10px; left:10px;"></div>
<div style="background: -moz-radial-gradient(150px 80px, circle closest-side, white, black); top:10px; left:220px;"></div>
<div style="background: -moz-radial-gradient(80px 50px, circle closest-side, white, black); top:220px; left:10px;"></div>
<div style="background: -moz-radial-gradient(80px 150px, circle closest-side, white, black); top:220px; left:220px;"></div>
<div style="background: -moz-radial-gradient(20px 40px, ellipse closest-side, white, black); top:430px; left:10px;"></div>
<div style="background: -moz-radial-gradient(180px 40px, ellipse closest-side, white, black); top:430px; left:220px;"></div>
<div style="background: -moz-radial-gradient(40px 20px, closest-side, white, black); top:640px; left:10px;"></div>
<div style="background: -moz-radial-gradient(40px 180px, closest-side, white, black); top:640px; left:220px;"></div>
